Geodesic
Neutral polyverbal operations
Matematičeskie zametki, Tome 4 (1968) no. 1, pp. 85-89 
O. N. Matsedonskaya. Neutral polyverbal operations. Matematičeskie zametki, Tome 4 (1968) no. 1, pp. 85-89. http://geodesic.mathdoc.fr/item/MZM_1968_4_1_a9/
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     author = {O. N. Matsedonskaya},
     title = {Neutral polyverbal operations},
     journal = {Matemati\v{c}eskie zametki},
     pages = {85--89},
     year = {1968},
     volume = {4},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1968_4_1_a9/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

It is shown that any neutral polyverbal subgroup $W$ is generated as a subgroup by the set of its fully neutral polywords, and a necessary and sufficient condition is given for an associative neutral polyverbal operation to be verbal. The associativity of verbal operations follows easily from these results and O. N. Golovin's theorem.